The i.r. spectra (1600–40 cm.–1), Raman spectra, and vibrational assignments are reported for some group IV complex hexafluorometallates of the type A2MF6(M = Ti, Zr, and Hf; A = NH4, K, Rb, Cs, and Tl). For these complex fluorides the number of observed i.r. bands was found to be in good agreement with that calculated by use of factor-group analysis. Bands below 130 cm.–1 in the i.r. spectra have been assigned to translatory lattice modes and the approximate frequency of the Raman-active ν2 mode for an MF62– octahedron was calculated by use of combination bands. Splitting of the Raman-active ν5 band has also been observed in some cases.
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Journal of the Chemical Society A: Inorganic, Physical, Theoretical
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